To multiply a whole number by 10, just add a zero...
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Ten times 10 is equal to 100. This is because when you multiply a number by 10, you are essentially adding a zero to the end of the number. In this case, multiplying 10 by 10 results in 100.
The answer is 10. 3 x 10 = 30 30 - 10 = 20
If the number is x then: 4x+10 = -2 and so the value of x is -3
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